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41 results

klog.c

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  • klog.c 1.95 KiB
    /*
     * Copyright (C) 2008 The Android Open Source Project
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    
    #include <errno.h>
    #include <fcntl.h>
    #include <stdarg.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <sys/stat.h>
    #include <sys/types.h>
    #include <unistd.h>
    
    #include <cutils/klog.h>
    
    static int klog_fd = -1;
    static int klog_level = KLOG_DEFAULT_LEVEL;
    
    int klog_get_level(void) {
        return klog_level;
    }
    
    void klog_set_level(int level) {
        klog_level = level;
    }
    
    void klog_init(void) {
        if (klog_fd >= 0) return; /* Already initialized */
    
        klog_fd = open("/dev/kmsg", O_WRONLY | O_CLOEXEC);
        if (klog_fd >= 0) {
            return;
        }
    
        static const char* name = "/dev/__kmsg__";
        if (mknod(name, S_IFCHR | 0600, (1 << 8) | 11) == 0) {
            klog_fd = open(name, O_WRONLY | O_CLOEXEC);
            unlink(name);
        }
    }
    
    #define LOG_BUF_MAX 512
    
    void klog_writev(int level, const struct iovec* iov, int iov_count) {
        if (level > klog_level) return;
        if (klog_fd < 0) klog_init();
        if (klog_fd < 0) return;
        TEMP_FAILURE_RETRY(writev(klog_fd, iov, iov_count));
    }
    
    void klog_write(int level, const char* fmt, ...) {
        if (level > klog_level) return;
        char buf[LOG_BUF_MAX];
        va_list ap;
        va_start(ap, fmt);
        vsnprintf(buf, sizeof(buf), fmt, ap);
        va_end(ap);